Banding artifacts in smoke viewport display #48015

New Issue

Niko Maisuradze · 2016-03-31T12:17:50+02:00

Niko Maisuradze commented

2016-03-31 12:17:50 +02:00

Windows 7, 980+980ti

Broken: official 2.77 and latest build (29bb10e)
Worked: 2.76b

Banding artifacts in smoke viewport display

Exact steps: add a plane, scale up a bit, add a quick smoke with dissolve checked, add light.

Checked on 2 computers

Windows 7, 980+980ti Broken: official 2.77 and latest build (29bb10e) Worked: 2.76b Banding artifacts in smoke viewport display Exact steps: add a plane, scale up a bit, add a quick smoke with dissolve checked, add light. Checked on 2 computers ![banding.JPG](https://archive.blender.org/developer/F299738/banding.JPG)

Niko Maisuradze commented

2016-03-31 12:17:50 +02:00

Changed status to: 'Open'

Niko Maisuradze commented

2016-03-31 12:17:50 +02:00

Added subscriber: @NikoMaisuradze

Lukas Tönne commented

2016-03-31 13:11:30 +02:00

Added subscriber: @LukasTonne

Kévin Dietrich was assigned by Lukas Tönne

2016-03-31 13:11:50 +02:00

Kévin Dietrich commented

2016-07-29 02:41:57 +02:00

Added subscribers: @MikeErwin, @brecht

Kévin Dietrich commented

2016-07-29 02:41:57 +02:00

I'm not sure if this really to be considered a bug, or a bug per se.

The issue is only visible when setting GL_LINEAR as the texture's min/mag filtering parameter. Doing the interpolatin by hand in the shader seems to help, but I can't get something decent without sacrificing performance at the moment (cubic interpolation takes its toll when it comes). In my test software, where the new smoke drawing code comes from, although it is using the same texture parameters (plus mipmaping), it does not have any such banding issue. The only difference is that I am using OpenGL 3.3, but I doubt it has anything to do here.

@MikeErwin, @brecht do you guys have any ideas how to approach this, or is it some weird OpenGL filtering issue fixed in later versions?

I'm not sure if this really to be considered a bug, or a bug per se. The issue is only visible when setting GL_LINEAR as the texture's min/mag filtering parameter. Doing the interpolatin by hand in the shader seems to help, but I can't get something decent without sacrificing performance at the moment (cubic interpolation takes its toll when it comes). In my test software, where the new smoke drawing code comes from, although it is using the same texture parameters (plus mipmaping), it does not have any such banding issue. The only difference is that I am using OpenGL 3.3, but I doubt it has anything to do here. @MikeErwin, @brecht do you guys have any ideas how to approach this, or is it some weird OpenGL filtering issue fixed in later versions?

Aaron Carlisle commented

2017-08-20 07:13:45 +02:00

Added subscriber: @Blendify